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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9981e0937fc003f25e9f9b884b323ddcefb37c5035bc5b2a7f3809799c38e68' 
  AND token = 'KVNyQgJNt1F/bWxIVQa3ZFJFfb71S3boyiX/g7/2TsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}